Rotary impact type screw driver



July 11, 1950 E. TURGEON 2,514,732

ROTARY IMPACT TYPE SCREW DRIVER Filed Oct. 25, 1946 Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q um mm ozww l N V E NTO R [mam/v0 Tunceolv BY (36 2M ATTORN EYS Patented July 11, 1950 Edmond Turgeon, Thompsonville,' 001111.; The Thompsonville Trust Company, Thompsonville, Conn., executor of said Edmond Turgen,-deceased, assignor to Peter L. Putriment, Enfield', Donald C. Morell, East Windsor,,and John J. Mazurek, Enfield, Conn., and Edward F. Saletnik, Springfield, Mass.

Application October 25, 1946, Serial No.. 705,729'

1 Claim. (Cl. 145-50) This invention relates to a seating and unseating tool of the character described in my previous Patent No. 1,743,505, January 14, 1930, and is more particularly directed to a further modification of such a tool over that shown in my copending application Serial No. 661,618, filed April 12, 1946, issued October 11, 1949, as Patent No. 2,484,765.

The object of this invention is to further improve this type of tool for making it readily adaptable for a seating or unseating tool, a screw driver, socket wrench, chisel, and other analogous uses. When the tool is employed for seating or unseating tight screws, bolts and the like, there will be a shank mounted for limited longitudinal and rotative movement relative to a driver handle, and means are provided to retain the parts together for such limited relative movement. For use as an ordinary screw driver or socket wrench, means are provided to hold the shank fast to the driver against relative movement either longitudinally or rotatively. The means for thus converting the tool from one use to another are designed to afford complete independence and efiiciency for each separate use, and to provide such advantages at low cost.

Further objects of the invention will be apparent in the following detailed description of the accompanying drawings, in which,

Fig. 1 is a side elevation of the complete tool partly broken away in section. In this view a screw driver shank is assembled. with the driver handle in a manner for using the tool as an ordinary screw driver; and

Fig. 2 is a similar view with the driver handle rotated at 90 from the position shown in Fig. 1, and with the shank in position for use as a seating or unseating tool.

Referring more particularly to the drawings, the tool as shown comprises a driver or handle I with a cylindrical surface which may be exteriorly knurled as indicated for better gripping. This driver has formed therein an axial socket 2 extending upwardly from its lower end and is adapted to receive therein the tool shank 3 which in the present illustration is a screw driver shank. The tubular wall of the driver surrounding the socket 2 has its lower edge portion formed into two similar and oppositely disposed concave cams 4, of inverted V shape, such as shown in Fig. 2. The upper end or Vertex of the concave cam 4 is indicated at 5, and the two spaced lower ends of said cam 4 are indicated at 6 and I. It will be understood that an exactly similar cam 8 is formed on the diametrically opposite side of the driver from that shown in Fig. 2, and will have a vertex top end v9 and a lower end I0 adjacent lower end 6 of cam 4 shown in Fig. 1. Between the lower ends of adjacent cams such as 6 and I0 is formed a vertical notch H which extends upwardly in the wall of the driver and has sides parallelto the axis of the driver. A similar notch'is formed at the diametrically op- .posite side of the driver from notch II.

The shank member 3 is provided with a cross lug 13 which is adapted to be engaged either in the cams 4 and 8 or in the notches II. The upper end' of the shank is rounded at I4 and when the shank is home in its uppermost position with respect to said driver this rounded end I 4 is bottomed firmly against the end surface l5 of the socket 2. Slightly below the top end of the shank 3 and annular groove is is formed in the shank with beveled edges as shown, and a coacting locking pin I! is carried in the driver and held by spring l8 so as to work in groove 16 for retaining the same in the driver when inserted in the socket 2 thereof. The pin and groove connections l6 and I! allow relative rotative movement between the shank and its driver for use as a seating or unseating tool as described in my patent referred to. The width of the groove [6 is such as to allow the cross lug I3 to work back and forth from the lower to the upper end of the cams 4 and 8. When the cross lug is at the vertex of cams 4 and 8, the top I4 of the shank is bottomed against end surface 15. Pin I! will normally hold the shank within the driver, but due to the beveled edges of the groove I 6, the shank 3 may be forcibly pulled out of the driver for replacement for any other type of shank suitable for use with this tool.

There is also provided in the bottom of groove 16 a spot recess 2| adapted to cooperate with pin I1 and so positioned that the locking pin 11 and said recess 2! will come into registration when the cross lug I3 is in its notches l I. Under these circumstances the shank will be held against both longitudinal and rotative movement relative to the driver for ordinary screw driver use of the shank. The longitudinal movement of shank 3 relative to the driver will be restriained by recess 2|, but this holding engagement is such that the shank may be forcibly withdrawn when desired. The vertical extent of the notches H from the lowermost ends of the driver l is preferably equal to the vertical extent of the cams 4 and 8 whereby when the cross lug I3 is in the notches II the head 14 of the shank will be bottomed against the surface l5 of the driver. Under these conditions the tool may be used as a chisel for pounding heavily upon the upper end of the driver I, and inasmuch as the hammer blows on the driver wili be directly transmitted to the shank 3 through the contacting surfaces H! and 15, there will be no strain on the crossv lug l3. 7 I

WhatIclaim is:

A tool of the class described comprising in combination, a driver serving as a handle and having an axial socket therein extending inwardly from one end, a shank removably fitted in said socket for longitudinal-and rotative movement with respect to said driver, the end surface of the driver at said one end being formed into a pair of oppositely positioned cam portions. each having oppositely inclined surfaces presenting a portion of V shape, and having a pair of oppositely disposed notches extending inwardly from said one end between the oppositely positioned cam portions, the extent of such notches v in an axial direction being equal to that of the cam portions, the sides of each notch being parallel to the axis of said tool, the shank having a lug engageable by said cam portions for the turning of said shank upon rela'tive longitudinal movement of. said driver, said shank lug also being engageable in said wall notches for locking REFERENCES CITED The following references are of record in the file of this patent:

' UNITED STATES PATENTS Number Name Date 294,663 Parmel'ee 4.-" Mar. 4, 1884 1,497,363 Doppel June 10, 1924 1,743,505 Turgeon Jan. 14, 1930 2-,32Q,360 Grey June 1, 1943 FOREIGN PATENTS Number Country Date 511,547 Great Britain Aug. 21, 1939 

